基于大涡模拟的CAARC模型角区开槽气动优化研究

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Abstract Super high-rise buildings are wind-sensitive structures, and appropriate aerodynamic optimization of building shape can effectively reduce the structural wind load and wind-induced response. Based on the large eddy simulation (LES) method, a new inflow turbulence generation - the NSRFG (Narrow band Synthesis Random Flow Generation) were used to investigate the effects of corner aerodynamic modification of the standard high-rise building model. First, the CAARC high-rise building standard model flow simulation was carried out, and the simulation results were compared with the wind tunnel test results to verify the applicability of the NSRFG method; then, based on the CAARC model, totally 4 corner modification schemes were designed and the base moments power spectrum were obtained through the LES simulation to estimate the top displacement and peak acceleration responses of the building. The results showed that: (1) For the standard high-rise building model with rectangular section, regardless of prototype or 4 modification schemes, the cross-wind fluctuation and peak acceleration are larger than that of the along-wind. (2) Compared with the prototype, all 4 modification schemes can reduce the wind-induced vibration response in along-wind and cross-wind directions, among which the corner slotting has the best optimization performance on along-wind response and the circumferential slotting has the best optimization performance on cross-wind response; (3) The optimization performance of the 4 modification schemes for the cross-wind response is obviously better than that for the along-wind response. Among the schemes, the circumferential slotting is the best, which can reduce the cross-wind fluctuating displacement and peak acceleration by 28.4% and 32.8%, respectively. Therefore, the circumferential slotting scheme is suggested to reduce the cross-wind response of super high-rise buildings with rectangular section.

Key words： large eddy simulation NSRFG method super high-rise building wind-induced response aerodynamic optimization

Received: 22 May 2023 Published: 15 April 2024

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	XU Zhouyang
	LUO Kaiwen
	YANG Yi

Cite this article:

XU Zhouyang,LUO Kaiwen,YANG Yi. Aerodynamic optimization of corner slotting in CAARC model based on LES[J]. JOURNAL OF VIBRATION AND SHOCK, 2024, 43(7): 126-133.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2024/V43/I7/126

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